• Annals of Clinical Neurophysiology
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• 제25권1호
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• pp.27-31
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• 2023

Orthostatic dizziness is feeling dizzy or lightheaded when standing up. Hemodynamic orthostatic dizziness can be caused by autonomic dysfunction such as orthostatic hypotension or postural tachycardia syndrome. The interpretation of the autonomic function test results in patients with orthostatic dizziness is crucial for diagnosing and managing the underlying condition. The head-up tilt and Valsalva tests are especially important for evaluating adrenergic function in patients with hemodynamic orthostatic dizziness. However, it is important to note that autonomic function tests do not cover the entire diagnostic process, since their findings need to be considered along with the detailed history and physical examination results of the patient because various differential diagnoses exist for orthostatic dizziness. Ensuring appropriate treatment by interpreting the autonomic function test results can help to determine the improvement of and prevents falls from orthostatic dizziness.

• Clinical and Experimental Pediatrics
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• 제65권1호
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• pp.47-52
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• 2022

Background: An adequate large-scale pediatric cohort based on nationwide administrative data is lacking in Korea. Purpose: This study aimed to differentiate patients with VVS by autonomic dysfunction severity using the composite autonomic severity score (CASS) and compare the clinical manifestations and prognosis between patient subgroups. Methods: We retrospectively reviewed the medical records of 66 VVS patients divided into 3 groups by CASS. To compare the differences between these groups, we analyzed VVS type, triggers, prodromal symptoms, management of syncope, and prognosis between patients with mild versus moderate autonomic dysfunction. Results: Of our 66 patients with VVS, 41 had mild autonomic dysfunction (62.1%) and 25 had moderate autonomic dysfunction (37.9%). We found no significant intergroup differences in age, sex, inducible factor (P=0.172), prodromal symptoms, laboratory findings, head-up tilt test, type of syncope, or prognosis (P=0.154). Conclusion: We found no evidence that autonomic dysfunction degree is affected by VVS characteristics, test findings, parameters, or prognosis; therefore, no further evaluations are needed to classify autonomic dysfunction severity.

• 셀메드
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• 제5권1호
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• pp.7.1-7.7
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• 2015

According to Ayurveda, an individual can be classified into any one of the seven constitutional types (Prakriti) depending on the dominance of one, two, or three Doshas. A 'Dosha' is representative of fundamental mechanisms that are responsible for homeostasis, and thus, to health. In the recent years, there have been several efforts to see whether certain physiological, haematological or biochemical parameters have any relationship with the constitutional types or not. The objective of the present study was to see if the results of autonomic function tests vary according to Prakriti of an individual. We conducted this study in clinically healthy volunteers of both the gender belonging to the age group of 17 to 35 years after obtaining their written consent. The Prakriti of these volunteers was assessed on the basis of a validated questionnaire and also by traditional method of interviewing. After confirming that the primary Dosha ascertained by both these methods matched, 106 volunteers were grouped into three on the basis of primary Dosha and were subjected to various autonomic function tests such as cold pressor test, standing-to-lying ratio, Valsalva ratio and pupillary responses such as pupil cycle time and pupil size measurement in light and dark. The results suggest that, the autonomic function tests in the healthy individuals may correlate linearly with the primary Dosha expressed in an individual. In particular, people with Kapha as the most dominant Dosha showed a tendency to have either a higher parasympathetic activity or a lower sympathetic activity with respect to their cardiovascular reactivity in comparison to the individuals with Pitta or Vata as the most dominant Dosha.

• 대한한의학회지
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• 제40권1호
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• pp.99-113
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• 2019

Objectives: This study is designed to identify the responses of autonomic nervous system and gastrointestinal function which are induced by acupuncture at abdominal anterior cutaneous nerve. Methods: This study is one group before and after pilot study. Subjects were treated once, after having been fasting six hours. They had before tests, labeling points for acupuncture, acupuncture, and after tests in order. The points of acupuncture were motor points of rectus abdominis where the abdominal anterior cutaneous nerve came to the skin from abdominal wall. Before and after tests were consisted of three things: Digital Infrared Thermographic Imaging(D.I.T.I.), Heart Rate Variability(HRV), and Recording of bowel sounds. Results: There were significant differences on the skin temperature of upper body and the frequency of bowel sounds(p<0.001, p<0.001). The HRV parameters and volume of bowel sounds had no significant differences(p>0.05, p>0.05). Conclusion: Even though no significant differences in HRV parameters, the significant differences of skin temperature of upper body and frequency of bowel sounds could mean acupuncture at abdominal anterior cutaneous nerve could affect the autonomic nervous system and gastrointestinal function. However, this study had no group to compare with. Future randomized project should address this issue.

• Journal of Medicine and Life Science
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• 제16권3호
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• pp.96-100
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• 2019

Postural tachycardia syndrome (POTS) is common, although not so well-known variant of cardiovascular autonomic disorder characterized by an excessive heart rate increase on standing. POTS is probably underdiagnosed due to the heterogeneity in both presentation and etiology. This study aimed to evaluate the clinical and autonomic features in patients with POTS. We reviewed the medical records of patients with POTS. Medical records include onset age, sex, presenting symptoms, body mass index (BMI) and prognosis. All patients had an autonomic function and laboratory tests. Ninety-nine patients met the inclusion criteria for POTS (51.5% male; mean±SD age, 20.0±9.7 years; mean±SD, BMI 21.9±3.9). Common presenting symptoms were a brief loss of consciousness, dizziness, blurred vision and headache. Autonomic function tests showed abnormal quantitative sudomotor axon reflex testing in 20 patients of 99 POTS patients. The abnormal post-ganglionic sympathetic sudomotor function is generally considered to reflect a neuropathic form of POTS. In treatments, 83 patients were treated by non-pharmacological management including lifestyle changes and 16 patients required the initiation of pharmacological therapies. Most patients with POTS showed a relatively favorable prognosis. POTS is a chronic disease with a substantial subset of patients recovering within a few years after the initial presentation. Future efforts should focus on better understanding of POTS pathophysiology and designing randomized controlled trials for the selection of more effective therapy.

• Annals of Clinical Neurophysiology
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• 제21권2호
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• pp.87-93
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• 2019

Background: The standardized autonomic function test has become widely available. However, there are no reference data for this test for the Korean population. This study explored reference data for sudomotor and cardiovagal function tests for the Korean population. Methods: The sweat volume by quantitative sudomotor axon reflex test, heart-rate response to deep breathing (HRdb), expiration:inspiration (E:I) ratio, and Valsalva ratio (VR) were measured in 297 healthy Korean volunteers aged from 20 to 69 years. Multivariate regression analysis was performed to evaluate the effects of age, sex, and body mass index on these variables. The 2.5th, 5th, 10th, 90th, 95th, and 97.5th percentile values were obtained for each investigation. Results: The sweat volume was higher in males than in females. The HRdb and E:I ratio were negatively correlated with age, and were higher in males than in females. The VR was negatively correlated with age, but it was not correlated with sex. Conclusions: This study has provided data on the reference ranges for sudomotor and cardiovagal function tests in healthy Korean adults.

• Tuberculosis and Respiratory Diseases
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• 제46권3호
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• pp.317-326
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• 1999

연구목적: 호흡기에 대한 자율신경 기능도 기도 및 혈관의 평활근, 접막하선의 점액분비. 기관지 순환 혈류조절, 비만 세포의 염증 반응에 관계되는 매개물의 분비등 매우 다양하게 나타나며 이들 자율신경 장애는 기도 폐쇄의 원인으로 작용한다. 천식은 자율신경계 이상이 원인으로 작용하고 특히 부교감신경 기능 항진이 중요한 원인으로 알려져 있다. 저자들은 심혈관계와 호흡기 자율신경 지배가 공통적으로 일어난다는 사실을 기초로 비관혈적이고 안정한 심혈관 지율신경 검사를 실시하여 만성 폐쇄성 폐질환 환자에서 자율신경 장애유무를 알아보았다. 방 법: 대상은 영남대학교 의과대학 부속병원에서 만성 폐쇄성 폐질환으로 진단 받은 환자 20명과 건강진단 센터에서 건강한 것으로 판정 받은 비슷한 나이의 20명을 대조군으로 하였다. 만성 폐쇄성 폐질환은 American Thoracic Society의 정의를 따랐으며 허혈성 심장질환, 부정맥, 당뇨병, 중심성 및 말초성 신경질환 등과 같은 자율신경계에 영향을 미칠 수 있는 질환이 동반된 경우는 제외하였다. 자율신경검사는 Ewing과 Clarke의 방법을 사용하였으며 모든 대상에서 동맥혈 가스분석과 폐기능 검사를 동시에 실시하였다. 결 과: 만성 폐쇄생 폐질환 환자는 건강한 사랑에 비하여 빈번하게 자율신경 장애가 동반되어 있었으며 만성 폐쇄성 폐질환 환자에서 교감신경 장애보다 부교감신경 장애가 더 뚜렷하였다. 만성 폐쇄성 폐질환은 질병 이환 기간이 길거나, 흡연량이 많거나, 폐기능 검사상 $FEV_1$ 및 FVC 감소 정도가 심할수록 그리고 저산소혈증이 심한 경우에 자율신경 장애가 심하였으나 연령, 만성폐쇄성 폐질환의 종류 및 동맥혈 이산화탄소 분압과는 차이가 없었다. 결 론: 만성 폐쇄성 폐질환은 부교감신경 장애가 동반되어 있으며, 부교간신경 장애는 만성 폐쇄성 폐질환의 정도가 심할수록 더 뚜렷하게 나타났다. 이러한 부교감신경 장애는 만성 폐쇄성 폐질환의 원인으로 작용하기보다는 질병의 진행으로 인한 자율신경계의 기능 저하로 생각된다.

• Annals of Clinical Neurophysiology
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• 제21권1호
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• pp.30-35
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• 2019

Background: Postural tachycardia syndrome (POTS) refers to the presence of orthostatic intolerance symptoms associated with a heart rate increment of greater than 30 beats/min, usually up to 120 beats/min, on head-up tilt test. Symptoms related to POTS are usually light-headedness, palpitations and tremor, but syncope can also occur. The pathophysiology of POTS is heterogeneous and its prognosis is uncertain. Methods: We prospectively evaluated patients who met the criteria for POTS, at baseline and follow-up, using composite autonomic symptom scores and autonomic tests to assess the autonomic function. We compared the clinical and autonomic test results between baseline and follow-up. Results: Sixty-eight patients met the inclusion criteria for POTS and forty-five patients were ultimately followed up for at least 1 year after baseline. The patients were predominantly young females (84%), with a mean age of 21 years. Most patients showed improved orthostatic symptoms and more than a quarter of patients had no longer met the criteria for POTS at follow-up. Conclusions: Most patients had a benign outcome in that they could resume their daily activities without great limitations. Our results demonstrated a relatively favorable prognosis in most patients with POTS.

• The Korean Journal of Physiology and Pharmacology
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• 제27권1호
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• pp.49-59
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• 2023

Metabolic syndrome (MetS) involves multi-factorial conditions linked to an elevated risk of type 2 diabetes mellitus and cardiovascular disease. Pre-metabolic syndrome (pre-MetS) possesses two MetS components but does not meet the MetS diagnostic criteria. Although cardiac autonomic derangements are evident in MetS, there is little information on their status in pre-MetS subjects. In this study, we sought to examine cardiac autonomic functions in pre-MetS and to determine which MetS component is more responsible for impaired cardiac autonomic functions. A total of 182 subjects were recruited and divided into healthy controls (n=89) and pre-MetS subjects (n=93) based on inclusion and exclusion criteria. We performed biochemical profiles on fasting blood samples to detect pre-MetS. Using standardized protocols, we evaluated anthropometric data, body composition, baroreflex sensitivity (BRS), heart rate variability (HRV), and autonomic function tests (AFTs). We further examined these parameters in pre-MetS subjects for each MetS component. Compared to healthy controls, we observed a significant cardiac autonomic dysfunction (CAD) through reduced BRS, lower overall HRV, and altered AFT parameters in pre-MetS subjects, accompanied by markedly varied anthropometric, clinical and biochemical parameters. Furthermore, all examined BRS, HRV, and AFT parameters exhibited an abnormal trend and significant correlation toward hyperglycemia. This study demonstrates CAD in pre-MetS subjects with reduced BRS, lower overall HRV, and altered AFT parameters. Hyperglycemia was considered an independent determinant of alterations in all the examined BRS, HRV, and AFT parameters. Thus, hyperglycemia may contribute to CAD in pre-MetS subjects before progressing to MetS.

• Clinical and Experimental Pediatrics
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• 제46권6호
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• pp.585-590
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• 2003

목 적 : 심혈관계 자율신경 기능이상은 청소년기 당뇨병 환자의 7.7-28%에서 동반되며, 당뇨병성 자율신경병증은 심장 교감 신경계 이상으로 인한 돌발성 부정맥 및 돌연사를 초래할 수 있는 것으로 보고되었다. 본 연구는 소아 및 청소년기 당뇨병 환자에서 심혈관계 자율신경 기능이상의 빈도 및 이에 영향을 미치는 인자들을 파악하여 당뇨병성 자율신경병증의 조기진단 및 치료에 도움이 되고자 시행하였다. 방 법 : 8-26세의 1형 당뇨병 환자 80명(남자 27명, 여자 53명)과 2형 당뇨병 환자 12명(남자 4명, 여자 8명)을 대상으로, 발살바 동작시 R-R 간격의 변화(발살바 비), 심호흡시 심박수의 변화, 기립시 R-R 간격의 변화(30 : 15 비), 기립성 저혈압의 4가지 항목에 대하여 검사를 시행하여 환자의 연령, 유병기간, 당화혈색소, 소변 알부민 배설량, 신경전달속도 이상 및 당뇨병성 망막증 유무와의 연관성을 분석하였다. 결 과 : 검사 당시 연령 및 평균 유병기간은 1형과 2형 당뇨병 환자간에 의미있는 차이가 없었으나, 당뇨병의 발병연령은 2형에서 더 높았다. 체질량지수는 1형에 비해 2형에서 의미있게 높았으며, 혈압 및 당화혈색소는 두 군간에 차이가 없었다. 1형 당뇨병 환자의 22.5%에서 조기, 8.7%에서 중등도, 1.3%에서 심한 자율신경병증에 해당하였으며, 2형의 경우 16.7%에서는 조기, 8.3%에서 중등도, 8.3%에서 심한 자율신경병증에 해당하였다. 전체적으로, 심혈관계 자율신경 기능 이상은 1형의 32.5%에서, 2형의 33.3% 에서 나타나 빈도에 있어서 두 군간에 차이는 보이지 않았다. 1형에서는 발살바 비와 유병기간 간에 의미있는 상관관계가 있었으며, 2형에서는 발살바 비와 연령, 심호흡시 심박수 변화와 당화혈색소, 그리고 기립성 저혈압과 유병기간 간에 의미있는 상관관계가 관찰되었다. 1형과 2형 당뇨병 환자 전체를 대상으로 시행한 로지스틱 회귀분석상, 연령(OR=1.133(1.003-1.279), P<0.05) 및 유병기간(OR=1.148(1.009-1.307), P<0.05)만이 자율신경 기능 이상의 의미있는 예측인자로 나타났으며, 당화혈색소, 혈압, 소변 알부민 배설량, 신경전달속도 이상 및 당뇨병성 망막증 유무와는 관련이 없었다. 검사항목 중 발살바 비는 31.5%의 환자에서, 심호흡시 심박수의 변화는 41.3%의 환자에서 경계역 또는 이상소견을 보인 반면, 30 : 15 비 및 혈압변화는 각각 14.1%, 9.8%에서 경계역 또는 이상소견을 보였다. 발살바 비(OR=0.001(0.000-0.083), P<0.01)와 심호흡시 심박수의 변화(OR=0.840(0.754-0.934), P<0.01)는 자율신경 기능이상 유무에 의미있게 영향을 미쳤으나, 30 : 15 비 및 기립성 저혈압은 영향을 미치지 못하였다. 결 론 : 심혈관계 자율신경 기능이상은 소아 및 청소년 당뇨병 환자의 32.6%에서 동반되었으며, 중등도 이상의 뚜렷한 자율신경 기능이상도 10.8%에서 관찰되었다. 혈당 조절이 양호한 환자에서도 자율신경계 합병증의 가능성은 배제할 수 없으며 연령 및 유병기간이 증가할수록 그 위험은 더욱 증가하였다. 소아 및 청소년기 당뇨병 환자에서 자율신경 기능검사시, 발살바 비와 심호흡시 심박수의 변화가 가장 유용한 검사 항목으로 사료된다.